<template>
  <view>
    <view class="search-box">
      <uni-search-bar :radius="100" @input="input" :cancelButton='none'></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length!==0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)"> 
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史区域 -->
    <view class="history-box" v-else>
      <!--标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: "",
        //搜索结果列表
        searchResults: [],
        //搜索历史数据
        historyList: []
      };
    },
    onLoad(){
      this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
    },
    methods: {
      input(e) {
        if(e.value===''){
          this.searchResults=[],
          clearTimeout(this.timer)
          return
        }
        clearTimeout(this.timer)
        //如果500毫秒没有新的输入，则可取关键值，这实现了搜索框的防抖
        this.timer = setTimeout(() => {
          this.kw = e.value
          this.getSearchList()
          // console.log(e.value)
        }, 500)
      },
      async getSearchList() {
        if (this.kw.length <= 0) return uni.$showMsg()
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      gotoDetail(goods_id){
        uni.navigateTo({
          url:'../goods_detail/goods_detail?goods_id='+goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set= new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        //调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      cleanHistory(){
        this.historyList=[]
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+item
        })
      }
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }
  .sugg-list{
    padding: 0 5px;
    .sugg-item{
      display: flex;
      border-bottom: 1px solid #efefef;
      justify-content: space-between;
      align-items: center;
      padding: 13px 0;
      font-size: 12px;
      .goods-name{
        //文字不允许换行，单行文本
        white-space: nowrap;
        //溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
     }
  }
</style>
